Composting has a reputation for being complicated, but the basics are genuinely simple. A pile of organic matter, kept reasonably moist and turned occasionally, will turn into rich compost. The only question is whether you do it in a way that produces results in weeks, or in a way that takes a year and smells unpleasant along the way.
This beginner's guide gives you everything you need to make excellent compost at home, whatever the size of your garden.
Why Compost at Home?
Composting turns kitchen scraps and garden waste into a free, nutrient-rich soil improver. It reduces household waste sent to landfill, cuts your need for bought fertilisers and soil conditioners, and dramatically improves the health and structure of your soil. For anyone serious about gardening, a compost system is one of the highest-value habits you can build.
Choosing the Right Composting System
Open Bay or Pile
A simple three-sided bay made from pallets, bricks, or timber is the most capable and affordable option for most gardens. Aim for a minimum size of one cubic metre, because smaller piles lose heat too quickly to break down efficiently.
Enclosed Bins
Plastic compost bins, often subsidised by local councils, suit smaller urban gardens. They hold heat and moisture well but are harder to turn and have limited capacity.
Tumblers
A tumbler is a sealed drum on a frame that you rotate to aerate. Tumblers produce compost quickly and keep pests out, but they cost more and hold less.
Worm Farms
A worm farm is ideal for apartments or anyone with more kitchen scraps than garden waste. It produces concentrated worm castings and liquid fertiliser, but cannot handle large volumes of garden material.
The Green-to-Brown Ratio (The Only Rule That Matters)
Compost works because microorganisms need both nitrogen-rich material (greens) and carbon-rich material (browns). Too many greens and the pile turns wet and smelly. Too many browns and it barely breaks down. The ideal ratio is roughly one part greens to three parts browns by volume.
Greens include fresh grass clippings, vegetable and fruit scraps, coffee grounds, tea leaves, and fresh garden prunings.
Browns include dry leaves, cardboard torn into small pieces, paper bags, straw, dry twigs, and paper egg cartons.
What You Should Not Compost
Keep these out of a standard home compost: cooked food, meat, fish, and dairy (they attract rodents and pests), diseased plant material (it can spread disease), weeds that have gone to seed, and persistent weeds like couch grass whose roots can survive and regrow.
Moisture and Aeration
Your pile should feel like a wrung-out sponge, moist but not dripping. Check monthly and water if it dries out. Turning the pile every two to four weeks adds the oxygen that decomposing microbes need. An unturned pile still composts, just much more slowly.
How Long Does Compost Take?
In warm weather with a well-managed pile, compost can be ready in six to twelve weeks. A cooler or rarely turned pile takes three to six months. A neglected pile takes a year or more. The key signal is heat: a pile that warms noticeably in the centre after a few days is breaking down quickly.
Compost is ready when it is dark, crumbly, smells earthy, and you can no longer identify the original ingredients.
Frequently Asked Questions
Why does my compost smell bad?
A bad smell almost always means too much green material and not enough air. Add more browns (dry leaves, shredded cardboard, or straw) and turn the pile to introduce oxygen. The smell should clear within a few days.
Can I compost in winter?
Yes, although decomposition slows significantly in cold weather. Keep adding material through winter and the pile will speed up again as temperatures rise.
Do I need to buy a compost starter or activator?
No. A good balance of greens and browns plus a handful of existing soil or finished compost provides all the microorganisms needed. Commercial activators are optional and rarely necessary.
How do I know when compost is ready to use?
Finished compost is dark brown, crumbly, smells earthy, and contains no recognisable scraps. If you can still see eggshells or vegetable pieces, give it more time.
Ready to put your compost to work? Read our guide on how to build a no-dig garden bed this weekend, where compost is the central ingredient.
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